4. Nitrogen is fixed in ecosystems in ways stated below. Which one of the statements below is false?

By cyanobacteria

By electrical discharges in the atmosphere

By industrially synthesised fertilizer

By denitrification

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5. Pollination by wind is called

anemophily

hydrophily

zoophily

entomophily

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6. Mutation is

a factor responsible for plant growth

a change which affects the offspring of F2 generation only

a change that is inherited

a change which affects the parents

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7. Radish is a

bulb

conn

modified root

tuber

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8. Movements due to light are shown by

flowering plants

lower plants

all land plants

all the plants

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9. Radioactivity is a phenomenon of the spontaneous emission of

protons (alpha particles)

electrons (beta particles)

gamma rays (short wave electromagnetic waves)

All of the above

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10. The hormone insulin is a :

Glycolipid

Fatty acid

Peptide

Sterol

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11. In the human eye, the focussing is done by :

to and fro movement of the eye lens

to and fro movement of the retina

change in the convexity of the eye lens

change in the refractive index of the eye fluids

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12. Which one of the following techniques can be used to establish the paternity of a child?

Protein analysis

Chromosome counting

Quantitative analysis of DNA

DNA finger printing

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13. Among the following food items, which one has the highest amount of carbohydrates?

Apple

Banana

Cabbage

Pea

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14. Desert plants would be characterised by :

vivipary

aerenchyma

aerial roots

sunken stomata

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15. The sweetest sugar is :

sucrose

glucose

fructose

lactose

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16. Which of the following statements are true in relation to transpiration and water movements in plants?1. Removing all the leaves from a plant will reduce the flow of water up the stem.2. Covering both sides of a leaf with a plastic film will reduce both stomatal and cuticular transpiration.3. Injecting detergents (which lower the surface tension of water) into the xylem of tree trunk could prevent water from reaching the upper branches.4. Along most of its route through a plant, water moves by diffusion either along cell walls or across protoplasts.

1, 2 and 3

1, 2 and 4

1, 3 and 4

2, 3 and 4

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17. DPT is a vaccine for :

diarrhoea, polio and typhoid

diphtheria, whooping cough and tetanus

diphtheria, polio and tetanus

diphttheria, whooping cough and typhoid

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18. Which of the following diseases is caused by the bite of a mad dog?

Hydrocele

Hydrophobia

Hydrocephatus

Hydroperitoneum

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19. Which of the following vitamins is essential for poor bone and teeth formation?